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Home/ Questions/Q 6592073
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Editorial Team
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Editorial Team
Asked: May 25, 20262026-05-25T17:30:29+00:00 2026-05-25T17:30:29+00:00

I have the following code: pillboxDataContext db = new pillboxDataContext(); userAccount newUser = new

  • 0

I have the following code:

        pillboxDataContext db = new pillboxDataContext();

        userAccount newUser = new userAccount();
        newUser.userName = "test123";
        newUser.userPhone = "1234567890";
        newUser.userEmail = "test@test.com";
        newUser.userPwd = "testpassword";
        newUser.userCreateDate = DateTime.Now;
        newUser.userAccountType = "basic";

        db.users.Add(newUser);
        db.SubmitChanges();

userAccount is my object with properties (that match up with the user table).

I’m confused on the db.users.Add(newUser); line. The .Add is stating: System.Data.LINQ.Table does not contain a definition for ‘Add’.

The examples I was following seem to indicate that the .Add should be allowed. I’m new at this so please any advice would be very helpful.

UPDATE:

I changed it to db.users.InsertOnSubmit(newUser); however, I’m still getting an error:

The best overloaded method match for
‘System.Data.Linq.Table.InsertOnSubmit(user)’ has some invalid
arguments

Fix!

After looking at other code samples I figured out that I was assigning my data to the class (userAccount) rather than the table (user).

So I changed: userAccount newUser = new userAccount(); to user newUser = new user();
Then everything worked like I expected.

Thanks for the info!

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  1. Editorial Team
    Editorial Team
    2026-05-25T17:30:29+00:00Added an answer on May 25, 2026 at 5:30 pm

    Yes, Add won’t work – I suspect you want InsertOnSubmit.

    db.users.InsertOnSubmit(newUser);
    db.SubmitChanges();
    
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